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. 2020 Oct 21;58(11):e01689-20. doi: 10.1128/JCM.01689-20

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Copyright © 2020 Zhao et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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FIG 1 — Recombinant soluble HA proteins used in this study. (A) Schematic depiction of antibody interaction with HA trimeric protein, HA1 protein, and HI (HA-conjugated nanoparticle). The triangle indicates the different number of epitopes targeted in the different assays. (B) Phylogenetic tree indicating genetic relationship of HAs from different influenza A subtypes. HA proteins used in this study are marked in yellow. (C) Schematic representation of the recombinant HA proteins, HA1 proteins, and HA-SpyTag proteins. The HA protein contains the HA1 and HA2 subunits fused to the GCN4 isoleucine zipper trimerization motif (GCN4) and Strep-tag II (ST). The HA1 protein contains the HA1 subunit of HA protein and ST. The HA-SpyTag protein has a schematic structure similar to that of the HA protein but carries an additional peptide SpyTag (Spy).